/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_ltrace.c: Traces a path to a client/server.
 *
 *  Copyright (C) 2002 Hybrid Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id: m_ltrace.c 131 2005-12-10 04:59:29Z jon $
 */

#include "stdinc.h"
#include "handlers.h"
#include "tools.h"
#include "hook.h"
#include "client.h"
#include "common.h"
#include "hash.h"
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "fdlist.h"
#include "s_bsd.h"
#include "s_serv.h"
#include "s_conf.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "irc_getnameinfo.h"

static void do_ltrace(struct Client *, int, char **);
static void m_ltrace(struct Client *, struct Client *, int, char **);
static void mo_ltrace(struct Client *, struct Client *, int, char **);

struct Message ltrace_msgtab = {
	"LTRACE", 0, 0, 0, 0, MFLG_SLOW, 0,
	{m_unregistered, m_ltrace, mo_ltrace, m_ignore, mo_ltrace, m_ignore}
};

#ifndef STATIC_MODULES
const char *_version = "$Revision: 131 $";
static struct Callback *ltrace_cb;

static void *
va_ltrace(va_list args)
{
	struct Client *source_p = va_arg(args, struct Client *);
	int parc = va_arg(args, int);
	char **parv = va_arg(args, char **);

	do_ltrace(source_p, parc, parv);
	return NULL;
}

void
_modinit(void)
{
	ltrace_cb = register_callback("doing_ltrace", va_ltrace);
	mod_add_cmd(&ltrace_msgtab);
}

void
_moddeinit(void)
{
	mod_del_cmd(&ltrace_msgtab);
	uninstall_hook(ltrace_cb, va_ltrace);
}
#endif

static int report_this_status(struct Client *source_p, struct Client *target_p, int dow,
			      int link_u_p, int link_u_s);

/*
 * m_ltrace()
 *
 *	parv[0] = sender prefix
 *	parv[1] = target client/server to trace
 */
static void
m_ltrace(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	char *tname;

	if(parc > 1)
		tname = parv[1];
	else
		tname = me.name;
	sendto_one(source_p, form_str(RPL_ENDOFTRACE), me.name, parv[0], tname);
}

/*
 * do_ltrace
 */
static void
do_ltrace(struct Client *source_p, int parc, char **parv)
{
	struct Client *target_p = NULL;
	int doall;
	int wilds, dow;
	dlink_node *ptr;
	char *looking_for = parv[0];
	char *tname = parc > 1 ? parv[1] : me.name;

	switch (hunt_server(source_p->from, source_p, ":%s LTRACE :%s", 1, parc, parv))
	{
	case HUNTED_PASS:	/* note: gets here only if parv[1] exists */
		{
			struct Client *ac2ptr = NULL;

			if((ac2ptr = find_client(tname)) == NULL)
				DLINK_FOREACH(ptr, global_client_list.head)
			{
				ac2ptr = ptr->data;

				if(match(tname, ac2ptr->name) || match(ac2ptr->name, tname))
					break;
				else
					ac2ptr = NULL;
			}

			if(ac2ptr != NULL)
				sendto_one(source_p, form_str(RPL_TRACELINK), me.name, looking_for,
					   ircd_version, tname, ac2ptr->from->name);
			else
				sendto_one(source_p, form_str(RPL_TRACELINK), me.name, looking_for,
					   ircd_version, tname, "ac2ptr_is_NULL!!");
			return;
		}
	case HUNTED_ISME:
		break;
	default:
		return;
	}

	doall = (parv[1] && (parc > 1)) ? match(tname, me.name) : TRUE;
	wilds = !parv[1] || strchr(tname, '*') || strchr(tname, '?');
	dow = wilds || doall;

	/* lusers cant issue ltrace.. */
	if(!dow)
	{
		const char *name;
		const char *class_name;
		char ipaddr[HOSTIPLEN];

		target_p = find_client(tname);

		if(target_p && IsClient(target_p))
		{
			name = get_client_name(target_p, HIDE_IP);
			/* Should this be sockhost? - stu */
			irc_getnameinfo((struct sockaddr *) &target_p->localClient->ip,
					target_p->localClient->ip.ss_len, ipaddr,
					HOSTIPLEN, NULL, 0, NI_NUMERICHOST);
			class_name = get_client_class(target_p);

			if(IsOper(target_p))
			{
				if(ConfigFileEntry.hide_spoof_ips)
					sendto_one(source_p, form_str(RPL_TRACEOPERATOR),
						   me.name, source_p->name, class_name, name,
						   (IsIPSpoof(target_p) ? "255.255.255.255" :
						    ipaddr), CurrentTime - target_p->lasttime,
						   CurrentTime - target_p->localClient->last);
				else
					sendto_one(source_p, form_str(RPL_TRACEOPERATOR),
						   me.name, source_p->name, class_name, name,
						   (IsIPSpoof(target_p) ? "255.255.255.255" :
						    ipaddr), CurrentTime - target_p->lasttime,
						   CurrentTime - target_p->localClient->last);
			}
		}

		sendto_one(source_p, form_str(RPL_ENDOFTRACE), me.name, source_p->name, tname);
		return;
	}

	/* report all opers */
	DLINK_FOREACH(ptr, local_client_list.head)
	{
		target_p = ptr->data;

		if(!IsOper(target_p))
			continue;

		if(!doall && wilds && !match(tname, target_p->name))
			continue;

		if(!dow && irccmp(tname, target_p->name))
			continue;

		report_this_status(source_p, target_p, dow, 0, 0);
	}

	/* report all servers */
	DLINK_FOREACH(ptr, serv_list.head)
	{
		target_p = ptr->data;

		if(!doall && wilds && !match(tname, target_p->name))
			continue;
		if(!dow && irccmp(tname, target_p->name))
			continue;

		report_this_status(source_p, target_p, dow, target_p->serv->dep_users,
				   target_p->serv->dep_servers);
	}

	sendto_one(source_p, form_str(RPL_ENDOFTRACE), me.name, parv[0], tname);
}

/*
 * mo_ltrace
 *      parv[0] = sender prefix
 *      parv[1] = servername
 */
static void
mo_ltrace(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	if(!IsOper(source_p))
	{
		sendto_one(source_p, form_str(RPL_ENDOFTRACE), me.name, parv[0],
			   parc > 1 ? parv[1] : me.name);
		return;
	}

	if(parc > 2)
		if(hunt_server(client_p, source_p, ":%s LTRACE %s :%s", 2, parc, parv))
			return;

#ifdef STATIC_MODULES
	do_ltrace(source_p, parc, parv);
#else
	execute_callback(ltrace_cb, source_p, parc, parv);
#endif
}

/*
 * report_this_status
 *
 * inputs	- pointer to client to report to
 * 		- pointer to client to report about
 * output	- counter of number of hits
 * side effects - NONE
 */
static int
report_this_status(struct Client *source_p, struct Client *target_p,
		   int dow, int link_u_p, int link_s_p)
{
	const char *name = NULL;
	const char *class_name = NULL;
	char ip[HOSTIPLEN];

	/* Should this be sockhost? - stu */
	irc_getnameinfo((struct sockaddr *) &target_p->localClient->ip,
			target_p->localClient->ip.ss_len, ip, HOSTIPLEN, NULL, 0, NI_NUMERICHOST);

	name = get_client_name(target_p, HIDE_IP);
	class_name = get_client_class(target_p);

	switch (target_p->status)
	{
	case STAT_CONNECTING:
		sendto_one(source_p, form_str(RPL_TRACECONNECTING), me.name,
			   source_p->name, class_name, IsAdmin(source_p) ? name : target_p->name);
		break;

	case STAT_HANDSHAKE:
		sendto_one(source_p, form_str(RPL_TRACEHANDSHAKE), me.name,
			   source_p->name, class_name, IsAdmin(source_p) ? name : target_p->name);
		break;

	case STAT_CLIENT:
		if(IsAdmin(target_p))
		{
			if(ConfigFileEntry.hide_spoof_ips)
				sendto_one(source_p, form_str(RPL_TRACEOPERATOR),
					   me.name, source_p->name, class_name, name,
					   (IsIPSpoof(target_p) ? "255.255.255.255" : ip),
					   CurrentTime - target_p->lasttime,
					   CurrentTime - target_p->localClient->last);
			else
				sendto_one(source_p, form_str(RPL_TRACEOPERATOR),
					   me.name, source_p->name, class_name, name,
					   IsAdmin(source_p) ? ip :
					   (IsIPSpoof(target_p) ? "255.255.255.255" : ip),
					   CurrentTime - target_p->lasttime,
					   CurrentTime - target_p->localClient->last);
		}
		else if(IsOper(target_p))
		{
			if(ConfigFileEntry.hide_spoof_ips)
				sendto_one(source_p, form_str(RPL_TRACEOPERATOR),
					   me.name, source_p->name, class_name, name,
					   (IsIPSpoof(target_p) ? "255.255.255.255" : ip),
					   CurrentTime - target_p->lasttime,
					   CurrentTime - target_p->localClient->last);
			else
				sendto_one(source_p, form_str(RPL_TRACEOPERATOR),
					   me.name, source_p->name, class_name, name,
					   (IsIPSpoof(target_p) ? "255.255.255.255" : ip),
					   CurrentTime - target_p->lasttime,
					   CurrentTime - target_p->localClient->last);
		}
		break;

	case STAT_SERVER:
		if(!IsAdmin(source_p))
			name = get_client_name(target_p, MASK_IP);

		sendto_one(source_p, form_str(RPL_TRACESERVER),
			   me.name, source_p->name, class_name, link_s_p,
			   link_u_p, name, *(target_p->serv->by) ?
			   target_p->serv->by : "*", "*",
			   me.name, CurrentTime - target_p->lasttime);
		break;

	case STAT_ME:
	case STAT_UNKNOWN:
		break;

	default:		/* ...we actually shouldn't come here... --msa */
		sendto_one(source_p, form_str(RPL_TRACENEWTYPE), me.name, source_p->name, name);
		break;
	}

	return 0;
}
